Unlocking the Codex harness: how we built the App Server
What changed
Learn how to embed the Codex agent using the Codex App Server, a bidirectional JSON-RPC API powering streaming progress, tool use, approvals, and diffs.
Why it matters
A concrete addition to Practical AI: Tools, Models & Frameworks: it changes what's available to builders today rather than being general commentary.
How it compares
Related prior coverage to compare against:
- Introducing Codex
- Introducing the Codex app
- Powering next generation applications with OpenAI Codex
Sources
- Unlocking the Codex harness: how we built the App Server (openai-blog)primary